十分钟教会你MIPS编程入门

http://courses.missouristate.edu/KenVollmar/mars/download.htm

# Comment giving name of program and description of function# 说明下程序的目的和作用（其实和高级语言都差不多了）# Template.s# Bare-bones outline of MIPS assembly language program
    .data       # variable declarations follow this line                # 数据变量声明                # ...
    .text       # instructions follow this line                  # 代码段部分  
main:      # indicates start of code (first instruction to execute)           # 主程序           # ...
# End of program, leave a blank line afterwards to make SPIM happy# 必须多给你一行，你才欢？

name:    storage_type     value(s)

examplevar1:        .word       3  # create a single integer variable with initial value 3# 声明一个 word 类型的变量 var1, 同时给其赋值为 3
array1:     .byte       'a','b'# create a 2-element character array with elements initialized# to  a  and  b# 声明一个存储2个字符的数组 array1，并赋值 'a', 'b'
array2:     .space      40  # allocate 40 consecutive bytes, with storage uninitialized# could be used as a 40-element character array, or a# 10-element integer array; a comment should indicate which!  # 为变量 array2 分配 40字节（bytes)未使用的连续空间，当然，对于这个变量# 到底要存放什么类型的值， 最好事先声明注释下！

load:        lw  register_destination, RAM_source        # copy word (4 bytes) at source RAM location to destination register.        # 从内存中 复制 RAM_source 的内容到 对应的寄存器中（lw中的'w'意为'word',即该数据大小为4个字节）        lb  register_destination, RAM_source        # copy byte at source RAM location to low-order byte of destination register,and sign-extend to higher-order bytes        # 同上， lb 意为 load byte
store word:        sw  register_source, RAM_destination        # store word in source register into RAM destination        # 将指定寄存器中的数据 写入到指定的内存中        sb  register_source, RAM_destination        # store byte (low-order) in source register into RAM destination
load immediate:        li  register_destination, value        # load immediate value into destination register

  .data        var1:  .word  23    # declare storage for var1; initial value is 23
  .text    __start:         lw  $t0, var1    # load contents of RAM location into register $t0:  $t0 = var1         li  $t1, 5       #  $t1 = 5   ("load immediate")         sw  $t1, var1    # store contents of register $t1 into RAM:  var1 = $t1         done

load address:    la  $t0, var1    # 将var1的RAM地址复制到寄存器$t0中indirect addressing:    lw  $t2, ($t0)    #将$t0中包含的RAM地址的值加载到$t2中    sw  $t2, ($t0)    # 将寄存器$ t2中的值存储到$ t0中包含的地址的RAM中based or indexed addressing:    lw  $t2, 4($t0)    # 将RAM地址($t0+4)的值存到$t2寄存器    sw  $t2, -12($t0)    # 将$t2寄存器的值存到地址($t0-12)中

    .data        array1:    .space  12    #  declare 12 bytes of storage to hold array of 3 integers    #  定义一个 12字节 长度的数组 array1, 容纳 3个整型    .text        __start:            la  $t0, array1              #  load base address of array into register $t0          #  让 $t0 = 数组首地址          li  $t1, 5              #  $t1 = 5   ("load immediate")          sw $t1, ($t0)              #  first array element set to 5; indirect addressing          # 对于 数组第一个元素赋值 array[0] = $1 = 5          li $t1, 13              #   $t1 = 13          sw $t1, 4($t0)              #  second array element set to 13          # 对于 数组第二个元素赋值 array[1] = $1 = 13           # (该数组中每个元素地址相距长度就是自身数据类型长度，即4字节， 所以对于array+4就是array[1])          li $t1, -7              #   $t1 = -7          sw $t1, 8($t0)              #  third array element set to -7          # 同上， array+8 = （address[array[0])+4）+ 4 = address(array[1]) + 4 = address(array[2])

    add  $t0,$t1,$t2      #  $t0 = $t1 + $t2;   add as signed (2's complement) integers    sub  $t2,$t3,$t4      #  $t2 = $t3, $t4    addi  $t2,$t3, 5      # $t2 = $t3 + 5;   "add immediate" (no sub immediate)    addu  $t1,$t6,$t7      # $t1 = $t6 + $t7;   add as unsigned integers    subu  $t1,$t6,$t7      # $t1 = $t6 + $t7;   subtract as unsigned integers    mult  $t3,$t4        # multiply 32-bit quantities in $t3 and $t4, and store 64-bit    # result in special registers Lo and Hi:  (Hi,Lo) = $t3 * $t4    div  $t5,$t6        # Lo = $t5 / $t6   (integer quotient)    # Hi = $t5 mod $t6   (remainder)    mfhi  $t0        # move quantity in special register Hi to $t0:   $t0 = Hi    mflo  $t1        # move quantity in special register Lo to $t1:   $t1 = Lo    # used to get at result of product or quotient    move  $t2,$t3  #  $t2 = $t3

b  target    #  unconditional branch to program label targetbeq  $t0,$t1,target  #  branch to target if  $t0 = $t1blt  $t0,$t1,target  #  branch to target if  $t0 < $t1ble  $t0,$t1,target  #  branch to target if  $t0 <= $t1bgt  $t0,$t1,target  #  branch to target if  $t0 > $t1bge  $t0,$t1,target  #  branch to target if  $t0 >= $t1bne  $t0,$t1,target  #  branch to target if  $t0 <> $t1

j  target  #  unconditional jump to program label target           # 看到就跳转，不用考虑任何条件  jr  $t3    # jump to address contained in $t3 ("jump register")           # 类似相对寻址，跳到该寄存器给出的地址处

jr  $ra  #  "jump register"

Print out integer value contained in register $t2
li  $v0, 1         # load appropriate system call code into register $v0;                   # 声明需要调用的操作代码为 1 （print_int) 并赋值给 $v0                   # code for printing integer is 1move    $a0, $t2   # move integer to be printed into $a0:  $a0 = $t2                   # 将要打印的整型赋值给 $a0syscall            # call operating system to perform operation

Read integer value, store in RAM location with label int_value (presumably declared in data section)li  $v0, 5           # load appropriate system call code into register $v0;                     # code for reading integer is 5syscall              # call operating system to perform operationsw  $v0, int_value   # value read from keyboard returned in register $v0;                     # store this in desired location

    .datastring1    .asciiz  "Print this.n"# declaration for string variable, # .asciiz directive makes string null terminated
    .text        main:    li  $v0, 4  # load appropriate system call code into register $v0;# code for printing string is 4                 la  $a0, string1# load address of string to be printed into $a0                  syscall  # call operating system to perform print operation

li  $v0, 10    　 # system call code for exit = 10syscall           # call operating sys

本文属于转载非原创，略有修改： https://www.cnblogs.com/thoupin/p/4018455.html这篇文章的英文原版地址在这里： https://minnie.tuhs.org/CompArch/Resources/mips_quick_tutorial.html